-3m(m+8)
A) -3m²+24
B) -3m²-24m
C) -24m²
D) -4m+5
B) -3m²-24m
To simplify the expression -3m(m+8), we'll use the distributive property.
Step 1: Distribute -3m to both terms in the parentheses:
-3m * m = -3m²
-3m * 8 = -24m
The simplified expression is then -3m² - 24m.
Therefore, the correct answer is B) -3m² - 24m.